Ro/di & Ph

[orucco]

I am setting up a 75 gal saltwater and I have read on this forum that RO water is best. I am going to buy a RO/DI unit but I have been told that these units will make the PH neutral or about 7.0. I am on a 425' well and the water out of the tap is 8.3 - 8.4 with a GH of about 20. I was also told that once I add the salt, ( Red Sea Salt ), that it will buffer it back up. Is this correct?.............Thanks.

 

[nas19320]

I believe RO/DI water, since it has no buffering capability, will very easily change its pH.

 

[bang guy]

There is no relationship between the PH of the freshwater used to mix salt and your aquarium PH.

 

[chris19]

Im on a well also and planned on getting a RO system too, but then realized that wells have low water pressure so youll need to add a booster pump to the unit, then if you have a decent amount of iron in your water youll have to filter that out before it enters the unit. Just to let you know. Chris

 

[nas19320]

Just because your on a well doesn't mean you'll need a booster pump. I'm on a fairly deep well and I do not have a booster pump for my RO/DI.

 

[chris19]

We have about 35-40 psi pressure, do you think that is effective enough to use an RODI sytem.

 

[nas19320]

This is frow airwaterice.com.
Low water pressure?
All RO membranes output is subject to three things, your water quality, water pressure and water temperature. The membrane is rated at 77degress and 50 PSI Every pound of pressure less than 50 subtract 2% of the output. Example. 40 psi subtract 20% of the 75 for 60 gpd Temperature subtract 1.4 % per degree lower 68 is 9. So subtract 12.6 % from the 60 gpd = 52.44 or 2.18 GPH.

 

[chris19]

Thanks